GT 630 to 480/580 would be a huge jump. The performance is around a gtx 660 - gtx 660 ti. They tend to run about $150 -$200 used. You should put in the gtx 580. Although you can sell them and buy yourself a gtx 770 which is better and newer.
Currently playing: Shin Megami Tensei Devil Survivor: Overclocked, Dirt 2, and Resistance 3
holy cow that is amazing, what in the world have i been doing this whole time? unfortunetly i can't sell both to get a 770. i have a second desktop with no card so i was gonna put the weaker of the 2 cards into that with the stronger one in my pc.
i just got batman origins, AC4 and splinter cell free with the codes it came with. how well will they run?